1//===- WasmWriter.h ---------------------------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef LLVM_LIB_OBJCOPY_WASM_WASMWRITER_H
10#define LLVM_LIB_OBJCOPY_WASM_WASMWRITER_H
11
12#include "WasmObject.h"
13#include <cstdint>
14#include <vector>
15
16namespace llvm {
17namespace objcopy {
18namespace wasm {
19
20class Writer {
21public:
22 Writer(Object &Obj, raw_ostream &Out) : Obj(Obj), Out(Out) {}
23 Error write();
24
25private:
26 using SectionHeader = SmallVector<char, 8>;
27 Object &Obj;
28 raw_ostream &Out;
29 std::vector<SectionHeader> SectionHeaders;
30
31 /// Generate a wasm section section header for S.
32 /// The header consists of
33 /// * A one-byte section ID (aka the section type).
34 /// * The size of the section contents, encoded as ULEB128.
35 /// * If the section is a custom section (type 0) it also has a name, which is
36 /// encoded as a length-prefixed string. The encoded section size *includes*
37 /// this string.
38 /// See https://webassembly.github.io/spec/core/binary/modules.html#sections
39 /// Return the header and store the total size in SectionSize.
40 static SectionHeader createSectionHeader(const Section &S,
41 size_t &SectionSize);
42 size_t finalize();
43};
44
45} // end namespace wasm
46} // end namespace objcopy
47} // end namespace llvm
48
49#endif // LLVM_LIB_OBJCOPY_WASM_WASMWRITER_H
50